The amount of customer acquisition costs capitalized during the year.

No definition available.

Name:	e_CustomerAcquisitionCostsCapitalized
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

It represents of Decrease in equity accounted investemetns of carrying amount

+ References

No definition available.

+ Details

Name:	e_DecreaseEquityAccountedInvestments
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of decrease in equity due to effect of adoption of ifrs.

+ References

No definition available.

+ Details

Name:	e_DecreaseInEquity
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of increase in equity due to effect of adoption of ifrs.

+ References

No definition available.

+ Details

Name:	e_IncreaseInEquity
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

It represetns of negative changes of before taxes

+ References

No definition available.

+ Details

Name:	e_NegativeChangeBeforeTaxesEquity
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=b
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_FinancialAssetsAvailableforsale
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 130
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 130
-Subparagraph d
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The increase (decrease) in the fair value measurement of the entity's own equity instruments. [Refer: At fair value [member]; Entity's own equity instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2018-01-01
-Paragraph 93
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_IncreaseDecreaseInFairValueMeasurementEntitysOwnEquityInstruments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 54
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_h&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_TradeAndOtherCurrentReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=ifrs-full_IncreaseDecreaseDueToApplicationOfIFRS15Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	e_CreditLossesAxis=e_SalesMethodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=e_IncreaseDecreaseDueToApplicationOfIFRS9Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	e_CreditLossesAxis=e_ExpectedCreditLossModelMember
Namespace Prefix:
Data Type:	na
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Period Type:

Changes in accounting policies (Details Textuals) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 02, 2018	Jan. 01, 2018
Negative change before taxes equity	€ 259
Customer Acquisition Costs Capitalized	60
Trade and other current receivables	14,101	€ 15,421		€ 14,156
Decrease equity accounted investments	6
Financial assets available-for-sale			€ 207
Impairment loss	1,701	€ 913
Increase (decrease) due to application of IFRS 15 [member]
Decrease In Equity	49
Customer Acquisition Costs Capitalized	87
Trade and other current receivables				(372)
Increase (decrease) due to application of IFRS 15 [member] \| Sales Method [Member]
Decrease In Equity	103
Increase Decrease Due To Application Of IFRS 9 [Member]
Trade and other current receivables	427			€ (427)
Decrease equity accounted investments	31
Increase In Equity	294
Increase Decrease in fair value Measurement	681
Increase Decrease Due To Application Of IFRS 9 [Member] \| Expected Credit Loss Model [Member]
Impairment loss	€ 356